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Influence of the nature of the metal ion on the rate of reduction of coordinated azomethine group

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Abstract

The kinetics of reduction of the azomethine bond in various Schiff bases and their transition metal complexes with sodium borohydride in dimethylformamide and ethanol solutions was studied. The reduction rate depends on both the structure of the starting Schiff bases and the nature of the metal ion. In transition metal N-phenylsalicylaldiminates, the rate of reduction of the azomethine group increases in the order Zn(II) < Ni(II) < Cu(II) < Co(II) < VO(II) < Mn(II). Similar trend is observed in other series of metal complexes with Schiff bases. The revealed trends are opposite to the Irving-Williams series of stability of complexes. This fact suggests that the major factor affecting the rate of reduction of the coordinated azomethine bond is the strength of its bonding with the metal ion. Depending on particular metal ion, the complexation can either decelerate or accelerate the reduction.

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Authors and Affiliations

  1. Institute of Chemical Problems, National Academy of Sciences of Azerbaijan, Huseyn Javid. av. 29, Baku, AZ1143, Azerbaijan

    A. A. Medzhidov & S. G. Mamedova

  2. Marmara University, Istanbul, Turkey

    A. Aydin, B. Yalcin, S. Tascioglu & E. Kaki

Authors
  1. A. A. Medzhidov
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  2. S. G. Mamedova
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  3. A. Aydin
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  4. B. Yalcin
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  5. S. Tascioglu
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  6. E. Kaki
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Corresponding author

Correspondence to A. A. Medzhidov.

Additional information

Original Russian Text © A.A. Medzhidov, S.G. Mamedova, A. Aydin, B. Yalcin, S. Tascioglu, E. Kaki, 2007, published in Zhurnal Obshchei Khimii, 2007, Vol. 77, No. 10, pp. 1695–1699.

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Medzhidov, A.A., Mamedova, S.G., Aydin, A. et al. Influence of the nature of the metal ion on the rate of reduction of coordinated azomethine group. Russ J Gen Chem 77, 1761–1765 (2007). https://doi.org/10.1134/S1070363207100155

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  • DOI: https://doi.org/10.1134/S1070363207100155

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